People who say you should pay are representative of a world gone mad. It's a hairdresser appointment. It's not a holiday cruise you booked! I have never, NEVER in my entire
life heard of such a thing for a
hairdresser charging a cancellation fee, especially if it is just an ordinary cut and not a huge formal doo/wedding.
Contrary to what a previous poster said, you did NOT enter into a contract with them, you signed nothing. You simply rang up to get a hair appointment, and then had to cancel. It's as simple as that. What next, pay a school fine if you couldn't make it to parent/teacher interview? Have to cancel a Doctor's appointment? Pay a fine! The amount of people suggesting you owe the hairdresser shit is deeply concerning. You owe them NOTHING. People often have to cancel or postpone. That's it. It happens. It's part of the job of being a hairdresser - cancelations. If the hairdresser can't deal with that basic fundamental concept that LIFE happens, then they shouldn't be in business.
DO NOT pay her a red cent! She has a CHEEK, considering she cancelled on you the first time, and I bet you didn't bill her half of that for your time. Besides, logically, HOW can she actually enforce it? She can't force you to enter her premises or pay her. You signed no contract. There were no signs or warnings on the premises, I presume? She doesn't have a single leg to stand on. Not one. And she is a CFer. Don't pay, you owe her shit! (meaning nothing). You owe yourself the courtesy of finding a better hairdresser, not an extortionist.